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1. GENERAL INFORMATION Mongoose/KXR 90/50
NO SPARK AT SPARK PLUG
Inspection/Adjustment Symptom Probable Cause
Replace with a new
spark plug and inspect
again
Weak or no spark Good spark Faulty spark plug
Check spark plug cap
and high-tension wire
for looseness
Not loose Loose Loose spark plug cap
Check CDI unit coupler
for looseness
Good Good Poorly connected coupler
Measure resistance
between terminals of
CDI unit coupler
Normal Abnormal
Check related parts
Faulty ignition switch
Weak battery
Normal Abnormal Faulty pulser coil
Faulty ignition coil
Faulty charging system
Broken wire harness
Poorly connected coupler
Check CDI unit with a
CDI unit tester
Normal Abnormal Faulty CDI unit
Check ignition coil with
a CDI unit tester
Abnormal Faulty ignition coil
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